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Answer: cytochromes
Answer	Crossword Clue
cytochromes	Any of a number of compounds consisting of heme bonded to a protein. Cytochromes function as electron transfer agents in many metabolic pathways, esp. cellular respiration
cytochromes	CYTOCHROME, any of a group of substances in living cells, of great importance in cell oxidation

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.

Answer: cytochromes